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+# Work Summary: Phase 2.2 - Authentication & Authorization
+**Date:** 2026-01-12
+**Status:** ✅ Complete (Core Authentication)
+
+## Overview
+Implemented a comprehensive JWT-based authentication system for the Attune API service, including user registration, login, token management, and password security.
+
+## Completed Tasks
+
+### 1. Database Migration
+- ✅ Created migration `20240102000001_add_identity_password.sql`
+- Added `password_hash` column to `identity` table
+- Column is nullable to support external auth providers and service accounts
+- Added index for faster password hash lookups
+
+### 2. Authentication Dependencies
+- ✅ Added `jsonwebtoken` 9.3 for JWT handling
+- ✅ Added `argon2` 0.5 for password hashing
+- ✅ Added `rand` 0.8 for secure random generation
+
+### 3. Core Authentication Modules
+
+#### Password Module (`auth/password.rs`)
+- ✅ Implemented Argon2id password hashing
+- ✅ Implemented password verification
+- ✅ Custom error types (`PasswordError`)
+- ✅ Comprehensive unit tests
+- Features:
+  - Secure salt generation using OS RNG
+  - Memory-hard algorithm (Argon2id)
+  - PHC string format for hashes
+
+#### JWT Module (`auth/jwt.rs`)
+- ✅ JWT token generation (access & refresh tokens)
+- ✅ JWT token validation and decoding
+- ✅ Claims structure with identity info
+- ✅ Token type differentiation (access vs refresh)
+- ✅ Configurable expiration times
+- ✅ Header extraction utilities
+- ✅ Custom error types (`JwtError`)
+- ✅ Comprehensive unit tests
+
+#### Middleware Module (`auth/middleware.rs`)
+- ✅ Authentication middleware (`require_auth`)
+- ✅ Request extractor (`RequireAuth`)
+- ✅ Authenticated user context
+- ✅ Custom error types with proper HTTP responses
+- Features:
+  - Validates JWT tokens from Authorization header
+  - Extracts claims and adds to request extensions
+  - Provides convenient access to identity ID and login
+
+### 4. Authentication DTOs (`dto/auth.rs`)
+- ✅ `LoginRequest` - User login credentials
+- ✅ `RegisterRequest` - New user registration
+- ✅ `TokenResponse` - JWT token response
+- ✅ `RefreshTokenRequest` - Token refresh
+- ✅ `ChangePasswordRequest` - Password change
+- ✅ `CurrentUserResponse` - Current user info
+- All DTOs include validation constraints
+
+### 5. Authentication Routes (`routes/auth.rs`)
+- ✅ POST `/auth/register` - Register new user
+- ✅ POST `/auth/login` - User login
+- ✅ POST `/auth/refresh` - Refresh access token
+- ✅ GET `/auth/me` - Get current user (protected)
+- ✅ POST `/auth/change-password` - Change password (protected)
+
+### 6. Application Integration
+- ✅ Added JWT config to `AppState`
+- ✅ Updated `main.rs` to initialize JWT configuration
+- ✅ Added auth routes to server router
+- ✅ Added error conversions for auth errors
+- ✅ Environment variable configuration:
+  - `JWT_SECRET` - Secret key for token signing
+  - `JWT_ACCESS_EXPIRATION` - Access token lifetime (default: 3600s)
+  - `JWT_REFRESH_EXPIRATION` - Refresh token lifetime (default: 604800s)
+
+### 7. Error Handling
+- ✅ Added `From` implementations for `JwtError` → `ApiError`
+- ✅ Added `From` implementations for `PasswordError` → `ApiError`
+- ✅ Added `From` implementations for `ParseIntError` → `ApiError`
+- Proper HTTP status codes for all auth errors (401, 403, 409)
+
+### 8. Documentation
+- ✅ Created comprehensive authentication documentation (`docs/authentication.md`)
+- Includes:
+  - Architecture overview
+  - Configuration guide
+  - API endpoint documentation
+  - Security best practices
+  - Usage examples with cURL
+  - Troubleshooting guide
+  - Future enhancements roadmap
+
+## Technical Details
+
+### Security Features
+1. **Password Hashing**
+   - Algorithm: Argon2id (memory-hard, resistant to GPU attacks)
+   - Unique salt per password
+   - PHC string format for storage
+
+2. **JWT Tokens**
+   - HS256 algorithm (HMAC-SHA256)
+   - Configurable secret key
+   - Separate access and refresh tokens
+   - Token type validation
+   - Expiration checking
+
+3. **Authentication Middleware**
+   - Bearer token extraction
+   - Token validation before route handling
+   - Claims injection into request context
+   - Automatic error responses
+
+### Data Storage
+- Password hashes stored in `identity.attributes` JSONB field
+- Format: `{"password_hash": "$argon2id$v=19$m=19456,t=2,p=1$..."}`
+- Nullable password_hash supports external auth providers
+
+### Token Structure
+```json
+{
+  "sub": "123",              // Identity ID
+  "login": "username",        // Username
+  "iat": 1234567890,         // Issued at
+  "exp": 1234571490,         // Expiration
+  "token_type": "access"     // Token type
+}
+```
+
+## Code Quality
+- ✅ All code compiles without errors
+- ✅ Comprehensive unit tests for password and JWT modules
+- ✅ Proper error handling throughout
+- ✅ Type-safe API with Rust's type system
+- ✅ Request validation using `validator` crate
+- ✅ Follows established project patterns
+
+## Testing
+- Unit tests for password hashing (hash generation, verification, salts)
+- Unit tests for JWT tokens (generation, validation, expiration)
+- Unit tests for middleware helpers
+- Manual testing pending database availability
+
+## Deferred Features
+The following features were deferred to **Phase 2.13** to focus on core authentication:
+- RBAC permission checking middleware
+- Identity management CRUD endpoints
+- Permission assignment endpoints
+- Permission set management
+- Advanced authorization rules
+
+These will be implemented after core CRUD APIs are complete.
+
+## Configuration Example
+
+```bash
+# .env file
+JWT_SECRET=your-super-secret-key-min-256-bits
+JWT_ACCESS_EXPIRATION=3600
+JWT_REFRESH_EXPIRATION=604800
+DATABASE_URL=postgresql://svc_attune:password@localhost:5432/attune
+```
+
+## Usage Examples
+
+### Registration
+```bash
+curl -X POST http://localhost:8080/auth/register \
+  -H "Content-Type: application/json" \
+  -d '{"login":"alice","password":"secure123","display_name":"Alice"}'
+```
+
+### Login
+```bash
+curl -X POST http://localhost:8080/auth/login \
+  -H "Content-Type: application/json" \
+  -d '{"login":"alice","password":"secure123"}'
+```
+
+### Protected Endpoint
+```bash
+curl http://localhost:8080/auth/me \
+  -H "Authorization: Bearer eyJhbGciOiJIUzI1NiIs..."
+```
+
+## Dependencies Added
+```toml
+jsonwebtoken = "9.3"
+argon2 = "0.5"
+rand = "0.8"
+```
+
+## Files Created/Modified
+
+### New Files
+- `migrations/20240102000001_add_identity_password.sql`
+- `crates/api/src/auth/mod.rs`
+- `crates/api/src/auth/password.rs`
+- `crates/api/src/auth/jwt.rs`
+- `crates/api/src/auth/middleware.rs`
+- `crates/api/src/dto/auth.rs`
+- `crates/api/src/routes/auth.rs`
+- `docs/authentication.md`
+
+### Modified Files
+- `crates/api/Cargo.toml` - Added auth dependencies
+- `crates/api/src/main.rs` - Added auth module, JWT config
+- `crates/api/src/state.rs` - Added JWT config to AppState
+- `crates/api/src/server.rs` - Added auth routes
+- `crates/api/src/dto/mod.rs` - Exported auth DTOs
+- `crates/api/src/routes/mod.rs` - Added auth routes module
+- `crates/api/src/middleware/error.rs` - Added auth error conversions
+- `work-summary/TODO.md` - Marked Phase 2.2 complete
+
+## Next Steps
+1. Start database and run migration
+2. Test authentication endpoints manually
+3. Proceed to **Phase 2.4: Action Management API**
+4. Continue with other CRUD APIs
+5. Return to RBAC implementation in Phase 2.13
+
+## Notes
+- JWT secret defaults to insecure value for development
+- Production deployments MUST set a strong JWT_SECRET
+- Password requirements: minimum 8 characters (can be enhanced)
+- Tokens are stateless (no server-side session storage)
+- Token revocation will be added in future enhancement
+
+## Build Status
+✅ Successfully compiles with warnings (unused imports to be cleaned up)
+✅ All authentication tests pass
+✅ Ready for integration testing once database is available
+
+## Security Considerations
+- Always use HTTPS in production
+- Rotate JWT secrets periodically
+- Consider implementing rate limiting on auth endpoints
+- Add MFA support in future releases
+- Implement token blacklisting for logout functionality